Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
THE ONLY, BUT POWERFUL
In early December 1939, the T-100 with a company other machines arrived at the front and soon participated in the fighting against the white Finns on the "Mannerheim line" in the...
THE PATCH FOR THE BATH
The damaged area of enamel in the bath, you can restore yourself. To do this, first clean it with sandpaper or an abrasive stick to metal, wipe with gasoline and allow to dry. To...
